package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;

@Service
@Slf4j
public class UserServiceImpl implements UserService {
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
      //调用微信接口服务，获得当前微信用户的openId
        String openid = getOpenid(userLoginDTO);//ctrl + alt +m 抽取成一个方法
        //判断openId是否为空，若为空表示登陆失败，抛出业务异常
        if(openid==null)
        {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断当前用户是否为新用户（查数据库，数据库中有就说明不是新用户否则就为新用户
        User user = userMapper.getByOpenid(openid);
        //若是新用户自动完成注册
        if(user==null)
        {
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);//controller中会使用到此主键值，所以使用主键返回
        }
        //若不是新用户，返回该用户对象
        return user;
    }

    private String getOpenid(UserLoginDTO userLoginDTO) {
        HashMap<String, String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code", userLoginDTO.getCode());
        map.put("grant_type","authorization_code");
        String s = HttpClientUtil.doGet(WX_LOGIN, map);
        JSONObject parse = JSON.parseObject(s);
        String openid = parse.getString("openid");
        return openid;
    }
}
